Side-to-side truck cover system

ABSTRACT

An arm assembly for a cover of a truck includes a base, an intermediate segment, and an extension. The base is pivotably connected to the truck proximate a top of a cab of the truck. The intermediate segment is pivotably connected to the base, and the extension is connected to the cover and pivotably connected to the intermediate segment.

TECHNICAL FIELD

This invention relates to covers for truck beds, and more particularlyto a side-to-side truck cover system.

BACKGROUND ART

Many trucks, particularly those hauling loose loads such as sand andgravel, need a truck cover to prevent the wind from blowing loadparticles off the load bed. Various apparatus have been devised forcovering a truck load. Some such apparatus include a motor forselectively winding a flexible cover. An effective truck cover should beone which is easily operated by the truck driver so as to selectivelycover and uncover the truck bed from the convenient location of thetruck cab. My U.S. Pat. No. 5,031,955, the disclosure of which is herebyincorporated by reference, provides a truck cover which may beconveniently motor operated from the cab of a truck to extend the coverfrom a winding assembly proximate the front of the truck bed and forwardthe rear of the truck bed.

A need also exists for systems that cover the truck bed from side toside. For instance, U.S. Pat. No. 5,328,228 shows a cover for truck bedand cargo. Similarly, U.S. Pat. No. 5,924,758 shows a roll assistmechanism for tarp systems. My U.S. Pat. No. 6,206,449, the disclosureof which is also hereby incorporated by reference, shows a side-to-sidetruck cover system including a pair of arms, each of which includes abase and an extension.

DISCLOSURE OF INVENTION

The present invention is an arm assembly for a cover of a truck. The armassembly comprises a base, an intermediate segment, and an extension.The base is pivotably connected proximate a top of a cab of the truck,and the intermediate segment is pivotably connected to the base. Theextension is connected to the cover and pivotably connected to theintermediate segment.

Accordingly, an object of this invention is to provide an assembly ofthe type described above which covers the bed of a truck from side toside.

Another object of this invention is to provide an assembly of the typedescribed above which provides selective, powered control over coveringand uncovering the load bed.

Still another object of this invention is to provide an assembly of thetype described above which can be mounted proximate the top of the truckcab.

These and other objects, features, and advantages of the presentinvention are readily apparent from the following detailed descriptionof the best mode for carrying out the invention when taken inconjunction with the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a truck including an apparatus accordingto the present invention for covering a bed of the truck;

FIG. 2 is a front view of the truck shown in FIG. 1;

FIG. 3 is a front view of the truck showing a cover in a partiallydeployed position;

FIG. 4 is a front view of the truck showing the cover in a more fullydeployed position; and

FIG. 5 is a front view of the truck showing the cover in a deployedposition.

BEST MODE FOR CARRYING OUT THE INVENTION

With reference to the drawings, the preferred embodiments of the presentinvention will be described. FIGS. 1 and 2 show an arm assembly 10according to the present invention for a flexible tarp or cover 12 of atruck. The arm assembly 10 comprises a base 14, an intermediate segment16 and an extension 18. The base 14 is mounted to the truck at a baseplate 20 proximate a top of a cab 22 of the truck. While the base plate20 is shown in the drawings above the top of the cab 22, it should beappreciated that the base plate may also mounted below the top of thecab 22 in the space between the cab and the trailer.

The base plate 20 includes at least one spiral torsion spring.Preferably, one end of each of the springs engages a groove formed inthe surface of and extending a substantial portion of the length of acenter shaft, while the other ends of the springs cooperate with alocator pin. Further details of this arrangement are taught by U.S. Pat.No. 5,887,937, which is hereby incorporated by reference. In this way,the base 14 is normally biased clockwise as shown across at least aportion of a front 24 of the truck bed through intermediate positionsshown in FIG. 3 and FIG. 4. A stop 26 is welded or otherwise attached tothe front 24 of the truck bed, and limits the pivotal movement of thebase 14.

The intermediate segment 16 is pivotally connected at one of its ends tothe base 14 by a hinge or knuckle 28. Preferably, a knuckle shaft iswelded or otherwise fixed to one of a pair of plates extending from anupper end of the base 14. The knuckle shaft extends through the lowerend of the intermediate segment 16 such that the knuckle shaft isrotatable with respect to the intermediate segment. One end of each of aplurality of spiral torsion springs preferably engages an axial grooveformed in the knuckle shaft. The other ends of the springs cooperatewith a knuckle locator pin. Further details of this arrangement aretaught by U.S. Pat. No. 5,944,374, which is hereby incorporated byreference.

The extension 18 is similarly connected at one of its ends to theintermediate segment 16. In this way, the intermediate segment 16 andthe extension 18 are normally biased clockwise as shown. Rotation of theintermediate segment 16 in both directions may be limited by one or morestops which are preferably in the form of plates 29. The plates 29 arewelded or otherwise attached to the knuckle 28, and extend inwardlytherefrom to engage the intermediate segment and prevent overrotation.The knuckle between the intermediate segment 16 and the extension 18 maybe provided with similar stops to limit rotation of the extension, ifnecessary.

A motor 30 is mounted on the distal end of the extension 18. A rotatablereel 32 extends from the motor 30, and is operatively connected to oneend of the cover 12 so as to function as a take-up spool. The other endof the cover 12 is clamped, riveted, or otherwise fixed at one or morepoints along a line below the top of one side 34 of the truck. In thefully uncovered position shown in FIGS. 1 and 2, the cover 12 is woundon the reel 32. In this position, the truck bed may dump rearwardly orin either the clockwise or counterclockwise direction withoutinterference from the retracted cover. An elastic cord 35 is alsopreferably provided proximate the rear of the truck for biasing the reeltoward the right side of the truck.

The motor 30 is preferably provided with a brake which allows, amongother things, for the apparatus to remain in the uncovered positionshown in FIGS. 1 and 2. When the brake is released, the base 14 swingstoward the right side 36 of the truck bed until it engages the stop 26,as shown in FIGS. 3, 4 and 5. As the base 14 is biased toward the rightside 36 of the truck, the knuckle springs also bias the intermediatesegment 16 and the extension 18 toward the right side of the truck so asto hold the cover 12 in tension. The motor 30 may be powered, fromwithin or without the cab of the truck, to facilitate this operation.Further details of one embodiment of the motor are taught by U.S. Pat.No. 5,829,819, which is hereby incorporated by reference.

In this way, the cover 12 is pulled off of the reel 32 and extended overthe load bed. One or more hooks may be provided to establish a positivestop to engage the reel 32 and prevent overextension, or additionalstops can be provided for the various sections of the arm assembly. Inthis event, the motor 30 can be reversed to drive the reel 32 andretract the cover 12 against the tension force of the springs to uncoverthe load bed. As an alternative to the hooks, the reel 32 can be tuckedbelow a lip on the top of the right side 36 of the truck, when such alip is available.

Any rotation of the base 14 less than about 250 degrees is contemplated,and in a preferred embodiment the base sweeps out an arc of about 120degrees. Rotation of the intermediate segment 16 relative to the base 14is normally in the range of about 185 degrees. Any rotation of theextension 18 relative to the intermediate segment 16 is alsocontemplated, and in a preferred embodiment the extension rotates atotal of about 250 degrees. By varying the position of the locator pins,the preload of the springs, the number of springs and/or the springconstant of the springs, the forces biasing the base, the intermediatesegment, and the extension toward the deployed position are variable. Ina preferred embodiment, six springs are used to bias the base 14, twosprings are used between the base and the intermediate segment 16, andone or two springs are used in the knuckle between the intermediatesegment and the extension 18. In this arrangement the knuckle betweenthe extension 18 and the intermediate segment 16 opens quickly, thusaccommodating the weight of the motor 30 and allowing the motor to swingfrom either its fully covered or uncovered place and clear therespective top edge of the side of the truck.

It should be understood that while the forms of the invention shown anddescribed above constitute preferred embodiments of the invention, theyare not intended to illustrate all possible forms thereof. It shouldalso be understood that the words used are words of description ratherthan limitation, and various changes may be made without departing fromthe spirit and scope of the invention disclosed.

What is claimed is:
 1. An apparatus for extending and retracting a coverover a bed of a truck, the apparatus comprising: a base pivotablyconnected to the truck proximate a top of the cab; an intermediatesegment pivotably connected to the base; an extension pivotablyconnected to the intermediate segment; a reel connected to theextension; and a motor mounted on the extension and drivingly engagedwith the reel to selectively extend and retract the cover over the truckbed.
 2. The apparatus of claim 1 further comprising a first stop fixedto a front of the bed of the truck.
 3. The apparatus of claim 2 whereinthe base engages the first stop to prevent further pivoting of the base.4. The apparatus of claim 1 further comprising a second stop extendingfrom the base.
 5. The apparatus of claim 4 wherein the second stoplimits rotation of the intermediate segment.
 6. The apparatus of claim 1wherein the base is biased toward a retracted position.
 7. An apparatusfor extending and retracting a cover over a bed of a truck, theapparatus comprising: a stop fixed to a front of the bed of the truck; abase connected to the truck proximate a top of the cab and pivotableacross the front of the bed of the truck until the base contacts thestop; an intermediate segment pivotably connected to the base; anextension pivotably connected to the intermediate segment; a reelconnected to the extension; and a motor mounted on the extension anddrivingly engaged with the reel to selectively extend and retract thecover over the truck bed.
 8. The apparatus of claim 7 further comprisinga plate extending from the base.
 9. The apparatus of claim 8 wherein theplate limits rotation of the intermediate segment.
 10. The apparatus ofclaim 7 wherein the base is biased toward a retracted position.